Energy-saving waste gas dust removal device capable of recovering waste heat

Abstract

The utility model discloses an energy-saving waste gas dust removal device capable of recovering waste heat. The energy-saving waste gas dust removal device comprises a waste gas inlet pipe, a multi-stage cyclone dust removal mechanism and a heat exchange mechanism which are communicated in sequence, the gas inlet end of the multi-stage cyclone dust removal mechanism is connected with a waste gas inlet pipe, and the gas outlet end of the multi-stage cyclone dust removal mechanism is provided with a waste gas pipeline; a heat exchange mechanism is arranged on the waste gas pipeline, and an induced draft fan is arranged at the exhaust end of the waste gas pipeline; at least two heat exchange cavities which are not communicated with each other are formed in the heat exchange mechanism, one heat exchange cavity is communicated with the combustion-supporting air preheating channel, and the other heat exchange cavity is communicated with the water inlet channel; the air outlet end of the combustion-supporting air preheating channel is connected with the air inlet side of the combustion equipment; the water inlet end of the water inlet channel is connected with a water source, and the water outlet end is connected with the hot water storage tank. The waste heat recovery and dust removal integrated structure design is adopted, energy is saved, dust removal is efficient, maintenance is easy and convenient, the structure is relatively compact, the occupied area is reduced, and operation is collaborative, stable and reliable.

Description

TECHNICAL FIELD

[0001] The utility model relates to industrial waste gas treatment technical field especially, and it is an energy -conserving type waste gas dust collector with recoverable waste heat. BACKGROUND

[0002] In the industrial production process, high-temperature waste gas usually contains a large amount of dust and waste heat resources.

[0003] In the prior art, the waste gas treatment system usually adopts bag dust removal or wet dust removal, but the following problems exist:

[0004] 1, waste heat is not effectively recovered, directly discharging causes energy waste;

[0005] 2, the traditional dust removal equipment (such as electric precipitator) needs additional electric energy to run, and the energy consumption is high, and the cost is increased;

[0006] 3, part of waste heat recovery device and dust removal system are independently designed, and the structure is complex, the land area is large, and the synergy is poor.

[0007] Therefore, in order to solve the above problems, an energy -conserving type waste gas dust collector with recoverable waste heat is needed, which reduces the system energy consumption through waste heat recovery, realizes waste gas discharge standard, and is suitable for metallurgy, chemical industry, ceramics and other high-temperature flue gas discharge scenes. UTILITY MODEL CONTENTS

[0008] To solve the above problems, the technical scheme adopted by the utility model is as follows:

[0009] An energy -conserving type waste gas dust collector with recoverable waste heat, characterized by comprising waste gas inlet pipe, multistage cyclone dust removal mechanism and heat exchange mechanism that are sequentially communicated;

[0010] The gas inlet end of the multistage cyclone dust removal mechanism is connected with the waste gas inlet pipe, and the gas outlet end is provided with a waste gas pipeline;

[0011] The gas inlet end of the waste gas inlet pipe is connected with the high-temperature waste gas source;

[0012] The waste gas pipeline is provided with a heat exchange mechanism, and the exhaust end of the waste gas pipeline is provided with an induced draft fan;

[0013] At least two heat exchange cavities that are not communicated with each other are arranged in the heat exchange mechanism, one of the heat exchange cavities is communicated with the combustion air preheating channel, and the other heat exchange cavity is communicated with the water inlet channel;

[0014] The gas outlet end of the combustion air preheating channel is connected with the gas inlet side of the combustion equipment;

[0015] The water inlet end of the water inlet channel is connected with the water source, and the water outlet end is connected with the hot water storage tank.

[0016] Preferably, the heat exchange mechanism is a heat pipe exchanger, comprising a shell and a plurality of heat exchange pipes arranged in the shell.

[0017] The two ends of the heat exchange pipes are communicated with the exhaust gas pipeline, and the heat exchange pipes and the shell form heat exchange cavities communicated with the combustion air preheating channel and the water inlet channel respectively.

[0018] Preferably, the multi-stage cyclone dust removal mechanism comprises a primary cyclone separator and a secondary cyclone separator connected in series.

[0019] The primary cyclone separator is used for separating large-particle dust in the exhaust gas, and the secondary cyclone separator is used for separating small-particle dust in the exhaust gas.

[0020] Preferably, the diameter ratio of the primary cyclone separator to the secondary cyclone separator is 1.3:1, and the tangential inlet flow velocities of the primary cyclone separator and the secondary cyclone separator are 16-21 m / s and 21-30 m / s respectively.

[0021] Preferably, a guide plate is arranged in the gas inlet end of the exhaust gas inlet pipe.

[0022] Preferably, a baffle is arranged in the combustion air preheating channel.

[0023] Preferably, a dust collecting box is arranged on the dust discharging port of each of the primary cyclone separator and the secondary cyclone separator, and a star-shaped dust discharging valve is arranged between the dust discharging port and the dust collecting box.

[0024] Preferably, a dust detection sensor is arranged on the exhaust gas pipeline between the multi-stage cyclone dust removal mechanism and the heat exchange mechanism.

[0025] The dust detection sensor is electrically connected with the multi-stage cyclone dust removal mechanism.

[0026] Compared with the prior art, the utility model has the advantages of:

[0027] 1. The heat exchange mechanism with double heat exchange cavities arranged on the exhaust gas pipeline absorbs waste heat and transfers the waste heat to the combustion air preheating channel, the preheated combustion air is delivered to the combustion equipment (such as a boiler) through a pipeline, fuel consumption is reduced, and the water in the water inlet channel forms hot water after passing through the heat exchange cavities and is stored in a hot water storage tank for use in other process machining, so that the system energy consumption is reduced through waste heat recovery, and the energy saving effect is realized.

[0028] 2. The multi-stage cyclone dust removal mechanism enables the exhaust gas to enter the multi-stage cyclone dust removal mechanism through the tangential inlet of the exhaust gas inlet pipe, and dust separation is realized through centrifugal force, compared with the filter bag or the complex spray dust removal structure of the prior art, the dust removal effect is good, the energy consumption is low, and the maintenance is simple.

[0029] 3. The waste heat recovery and dust removal are integrated, the structure is relatively compact, the land occupation is reduced, and operation cooperation, stability and reliability are greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a structural schematic view of the utility model;

[0031] Figure 2 is Figure 1 is a local enlarged schematic view of A in the figure;

[0032] Wherein: waste gas inlet pipe 1, multistage cyclone dust removal mechanism 2, heat exchange mechanism 3, waste gas pipeline 4, high-temperature waste gas source 5, induced draft fan 6, combustion air preheating channel 7, water inlet channel 8, combustion equipment 9, hot water storage tank 10, guide plate 11, baffle plate 12, dust collecting box 13, star-shaped dust unloading valve 14, dust detection sensor 15, primary cyclone separator 21, secondary cyclone separator 22, shell 31, heat exchange pipe 32, dust unloading port 20, heat exchange cavity 30. DETAILED DESCRIPTION

[0033] In order to facilitate the understanding of the utility model, the utility model will be described more fully below with reference to the relevant drawings. The preferred embodiments of the utility model are shown in the drawings. However, the utility model can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0034] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "left", "right", "upper", "lower", "front", "back" and similar expressions as used herein are for the purpose of illustration only.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0036] The utility model will be further described below in conjunction with the drawings and specific embodiments:

[0037] As Figure 1 , 2As shown, an energy-saving waste gas dust removal device capable of recovering waste heat includes a waste gas inlet pipe 1, a multi-stage cyclone dust removal mechanism 2, and a heat exchange mechanism 3 connected in sequence.

[0038] The inlet end of the multi-stage cyclone dust removal mechanism 2 is connected to the exhaust gas inlet pipe 1, and the outlet end is provided with an exhaust gas pipe 4.

[0039] The inlet end of the exhaust gas inlet pipe 1 is connected to the high-temperature exhaust gas source 5;

[0040] A heat exchange mechanism 3 is provided on the exhaust gas pipeline 4, and an induced draft fan 6 is provided at the exhaust end of the exhaust gas pipeline 4.

[0041] The heat exchange mechanism 3 is provided with at least two non-communicating heat exchange chambers 30, one of which is connected to the combustion air preheating channel 7, and the other is connected to the water inlet channel 8.

[0042] The outlet end of the combustion air preheating channel 7 is connected to the inlet side of the combustion device 9;

[0043] The water inlet end of the water inlet channel 8 is connected to the water source, and the water outlet end is connected to the hot water storage tank 10.

[0044] In this embodiment, by setting a heat exchange mechanism 3 with a double heat exchange chamber 30 structure on the exhaust gas pipe 4, the waste heat of the exhaust gas is absorbed and transferred to the combustion air preheating channel 7. The preheated combustion air is transported to the combustion equipment 9 (such as a boiler) through the pipe, reducing fuel consumption. At the same time, the water in the water inlet channel 8 is converted into hot water after passing through the heat exchange chamber 30 and stored in the hot water storage tank 10 for use in other processes. Thus, the system energy consumption is reduced through waste heat recovery, achieving energy-saving effect.

[0045] In this embodiment, the multi-stage cyclone dust removal mechanism 2 allows the exhaust gas to enter the multi-stage cyclone dust removal mechanism 2 from the tangential inlet of the exhaust gas inlet pipe 1, and the dust is separated by centrifugal force. Compared with the filter bag or complex spray dust removal structure of the prior art, the dust removal effect is better, the energy consumption is lower, and the maintenance is simpler.

[0046] The above structure adopts an integrated design for waste heat recovery and dust removal, which is relatively compact, reduces the footprint, and greatly improves operational synergy, stability and reliability.

[0047] Furthermore, such as Figure 1 As shown, in order to realize the multi-purpose application of waste heat recovery and improve energy-saving effect, the heat exchange mechanism 3 is a heat pipe heat exchanger, including a shell 31 and a plurality of heat exchange tubes 32 disposed in the shell 31.

[0048] The two ends of the heat exchange tube 32 are connected to the exhaust gas pipe 4, and the heat exchange tube 32 and the outer shell 31 form a heat exchange chamber 30 that is connected to the combustion air preheating channel 7 and the water inlet channel 8 respectively.

[0049] Further, as shown in Figure 1 In order to realize the step-by-step separation of dust and improve the dust removal effect of the waste gas, the multi-stage cyclone dust removal mechanism 2 comprises a first-stage cyclone separator 21 and a second-stage cyclone separator 22 connected in series.

[0050] The first-stage cyclone separator 21 is used for separating large-particle dust in the waste gas, and the second-stage cyclone separator 22 is used for separating small-particle dust in the waste gas.

[0051] Further, as shown in Figure 1 The diameter ratio of the first-stage cyclone separator 21 and the second-stage cyclone separator 22 is 1.3:1, and the tangential inlet flow velocities of the first-stage cyclone separator 21 and the second-stage cyclone separator 22 are 16-21 m / s and 21-30 m / s, respectively.

[0052] In this embodiment, the first-stage cyclone separator 21 is designed to utilize a lower flow velocity and a larger diameter to preferentially separate large-particle dust in the gas flow, reduce the risk of wear and blockage of the second-stage equipment, and realize coarse separation. Meanwhile, when the flow velocity is low, the flow resistance is small, the system energy consumption is controllable, and the pressure loss is effectively reduced.

[0053] In this embodiment, the second-stage cyclone separator 22 is designed to utilize a higher flow velocity (21-30 m / s) and a small diameter structure to greatly enhance the centrifugal force strength, effectively capture fine particles (such as PM10 and below) that are not removed by the first stage, and realize fine separation. Meanwhile, high flow velocity enhances turbulent disturbance, reduces particle escape, and the comprehensive separation efficiency can reach 95%-99%, thereby strengthening the dust separation efficiency and effect.

[0054] The above structure utilizes two-stage flow velocity differentiation design to avoid excessive pressure loss caused by high flow velocity throughout, balances efficiency and economy, and achieves energy consumption balance.

[0055] Further, as shown in Figure 1 In order to guide the waste gas to uniformly enter the multi-stage cyclone dust removal mechanism 2 and improve the gas inlet effect, a guide plate 11 is arranged in the gas inlet end of the waste gas inlet pipe 1.

[0056] Further, as shown in Figure 1 In order to prolong the heat exchange time of air in the combustion air preheating channel 7 and improve the heat exchange efficiency, a baffle 12 is arranged in the combustion air preheating channel 7.

[0057] Further, as shown in Figure 2As shown, in order to maintain the air tightness in the separator when discharging dust, prevent external air suction or internal gas leakage, stabilize the separator internal pressure and airflow distribution; the first cyclone separator 21 and the second cyclone separator 22 are both provided with a dust collecting box 13 on the dust discharging port 20, and a star-shaped dust discharging valve 14 is arranged between the dust discharging port 20 and the dust collecting box 13.

[0058] Further, as Figure 1 As shown, in order to realize automatic monitoring and control of dust removal and improve the reliability of dust removal; the dust detection sensor 15 is arranged on the waste gas pipeline 4 between the multi-stage cyclone dust removal mechanism 2 and the heat exchange mechanism 3.

[0059] The dust detection sensor 15 is electrically connected with the multi-stage cyclone dust removal mechanism 2.

[0060] In this embodiment, the running speed of the multi-stage cyclone dust removal mechanism 2 is controlled according to the monitoring of the dust detection sensor 15, realizing low energy consumption, high efficiency and high reliable dust removal.

[0061] For those skilled in the art, according to the above described technical solutions and concepts, other various corresponding changes and deformations can be made, and all of these changes and deformations should belong to the protection scope of the patent claims of the present application.

Claims

1. An energy-saving waste gas dedusting device capable of recycling waste heat, characterized in that, The waste gas inlet pipe, the multi-stage cyclone dust removal mechanism and the heat exchange mechanism are sequentially connected; The gas inlet end of the multi-stage cyclone dust removal mechanism is connected with the waste gas inlet pipe, and the gas outlet end is provided with a waste gas pipeline; The gas inlet end of the waste gas inlet pipe is connected with a high-temperature waste gas source; The heat exchange mechanism is arranged on the waste gas pipeline, and an exhaust fan is arranged at the exhaust end of the waste gas pipeline; At least two heat exchange cavities which are not communicated with each other are arranged in the heat exchange mechanism, one of the heat exchange cavities is communicated with the combustion air preheating channel, and the other heat exchange cavity is communicated with the water inlet channel; The gas outlet end of the combustion air preheating channel is connected with the gas inlet side of the combustion equipment; The water inlet end of the water inlet channel is connected with a water source, and the water outlet end is connected with a hot water storage tank.

2. The energy-saving waste gas dedusting device with recyclable waste heat according to claim 1, characterized in that, The heat exchange mechanism is a heat pipe heat exchanger, which comprises a shell and a plurality of heat exchange pipes arranged in the shell; The two ends of the heat exchange pipe are communicated with the waste gas pipeline, and the heat exchange pipe and the shell form heat exchange cavities which are communicated with the combustion air preheating channel and the water inlet channel respectively.

3. The energy-saving waste gas dedusting device with recyclable waste heat according to claim 1, characterized in that, The multi-stage cyclone dust removal mechanism comprises a primary cyclone separator and a secondary cyclone separator connected in series; The primary cyclone separator is used for separating large particle dust in the waste gas, and the secondary cyclone separator is used for separating small particle dust in the waste gas.

4. The energy-saving waste gas dedusting device with recyclable waste heat according to claim 3, characterized in that, The diameter ratio of the primary cyclone separator and the secondary cyclone separator is 1.3:1, and the tangential inlet flow velocities of the primary cyclone separator and the secondary cyclone separator are 16-21 m / s and 21-30 m / s respectively.

5. The energy-saving waste gas dedusting device with recyclable waste heat according to claim 1, characterized in that, A guide plate is arranged in the gas inlet end of the waste gas inlet pipe.

6. The energy-saving waste gas dedusting device with recyclable waste heat according to claim 1, characterized in that, A baffle plate is arranged in the combustion air preheating channel.

7. The energy-saving waste gas dedusting device with recyclable waste heat according to claim 3, characterized in that, A dust collecting box is arranged on the dust discharging port of the primary cyclone separator and the secondary cyclone separator, and a star-shaped dust discharging valve is arranged between the dust discharging port and the dust collecting box.

8. The energy-saving waste gas dedusting device with recyclable waste heat according to claim 1, characterized in that, A dust detection sensor is arranged on the waste gas pipeline between the multi-stage cyclone dust removal mechanism and the heat exchange mechanism; The dust detection sensor is electrically connected with the multi-stage cyclone dust removal mechanism.

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